It is a trial version, but that only means a 10 second countdown before it unlocks each time. I use it for the frame limiter to limit video fps to 30. Use it with any game. Or you can find a Skyrim fps limiter at skyrimnexus.

Yeah, the FPS limiter from http://www.kegetys.net works perfectly! Now i'm just fiddling to see how high I can get the cap before the bugs start occurring. 75 seems okay, but 120 will trigger it. Shame, because 120 is desirable because it almost looks vsynced...